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Page 2 Date: May 24, 2007 To: City of Arden Hills Planning Commission and City Council % Mr. James Lehnhoff, City Planner Re: Celestica Parking Lot Addition - 4300 Round Lake Road West, Arden Hills, MN PROJECT BACKGROUND complex of buildings which was not expected in the original design of the complex. It was assumed that the ability for shared parking existed to accommodate these variable needs between the adjacent properties. In essence this complex was designed as a Planned Unit Development even though the designation was not officially given to the development by the City due to the G-B Zoning. This 11.18 acre property is located at 4300 Round Lake Road West and is bordered by office warehouse buildings to the north and the south. 1-35W is to the west and Round Lake is to the East. The site is currently zoned G-B Gateway Business and is fully developed with a 174,304 square foot office/warehouse building with parking surrounding the structure. The perimeters are well landscaped and the furthest eastern slope on the property is naturally wooded. The original design of the site with the loading docks placed on the south side of the building concerned the City Council in the original approvals and as a result the south border of the property was heavily landscaped. Subsequently, Welsh acquired the property to the south and the scope of their Gateway Business Park project expanded to include the three existing buildings located to the south of this site. As a result, we prepared an EAW for the overall development because of the scale of the project and several natural features were protected or enhanced as a result of that process. One of the outcomes of the expansion of the project was the re-routing of Round Lake Road West and the addition of Gateway Court. The significance on this project is that this site was already developed and additional right of way was needed from this site to create the Gateway Court cul-du- sac. That is why the building coverage is slightly over (30.8%) the maximum allowable coverage of 30% for a one story building in this zoning district. This also impacted on the pervious/impervious percentages for the property. GRADING. DRAINAGE AND EROSION CONTROL: The proposed grading to accommodate the additional parking surface will be a natural extension of the existing parking surface grades and be accommodated in the existing storm sewer system currently located in this portion of the property. Standard erosion control methods will be used during the construction of the parking lot expansion to minimize erosion. The small scale of the project and the short construction time line will also help to minimize any erosion impacts generated with this construction activity. STORMWATER DESIGN In the process of analyzing the site's sub-watershed makeup, several options were analyzed to provide for adequate treatment of the increase In storm water runoff. The first two options that were reviewed were infiltration treatment or filtration treatment. Both of these options are dependent on having soils that are conducive to storm water permeating the existing soils. Our geotechnical engineering firm, Braun Intertec, analyzed the soils and their preliminary findings are that the soils are 7200 Hudson Blvd. Suite 110 OAKDALE, MINNESOTA 55128 PHONE (651) 739-8131 FAX (651) 739-0846 www.proterradesign.com